Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7564abeca5e365b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 20:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35e12f628cd779759f1f9c3228a26ccf SHA-1: 6933e0d435e52985624e39e4500ac5255e58480e SHA-256: d7564abeca5e365bbc0b853a28948bb0a4d7f6c7c5bf2be9b08e9089c9368a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics indicate a focus on external URI redirection and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055a1d63779---4300407612.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/70990123602.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rsvltgtlfobf2clfakct49sp66/nurevupuligajalefozoj.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ffab55a9---gufuxekofovanakujo.pdf
    • https://zold-kommando.hu/files/88047646049.pdf
    • https://accuratesearch.com/userfiles/file/36057340978.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b87f2f1da---natezusamuzepifafeg.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b067df43c210e7e96b64cb2c2047542/pidufafu.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/foxesokixubub.pdf
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/855646350.pdf
    • http://www.urbanwaterways.info/files/firedu.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d47249ec4dc3f384a8378dba616618d0/takipelirudak.pdf
    • http://thevisionkharj.com/userfiles/files/xevuwerowifotur.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a50859db3dc78fc9927796476bb285ea/75220290924.pdf
    • http://asianmosaicnyc.com/userfiles/file/kilujeb.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088795abbbce---57289938679.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210524/file/16218424307984.pdf
    • http://rollfactorytogo.com/uploads/files/nepebuzugitujexuboto.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105dab8ad374---4201787309.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0810/96377361ae35e81bb4a50065ae6e8824.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/28524199832.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/75399724013.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/pateke.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/290dd86f0456f7e0f8bff6e16df2444a/78834825873.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd3aac76f5---zogedupefiwepu.pdf
    • https://braindevelopmentmaps.org/userfiles/files/57937463942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ergonomia+projeto+e+produ%C3%A7%C3%A3o+3+edi%C3%A7%C3%A3o+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de02.bin
78d73ee0a112828f5e609c01c5506ec5079d7d8107f9c9f7a371fa7fff469416
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 18780 bytes
font_01_sfnt_off00010bc8.bin
eebb1e42bc47d872e5694eb874a1e7e8d39891a4185b8c4b545ed0232eb27f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 11476 bytes
font_02_sfnt_off0001263d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16792 bytes